Blocked, Invalid, or Bounced Addresses

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Are unsubscribe groups the same as suppression lists? Not exactly.

The two complement each other, but they serve different purposes. The unsubscribe group reflects the recipient’s choice to stop receiving emails, while the suppression list ensures that no further emails are sent to those who have unsubscribed.

Without a suppression list, unsubscribing would be ineffective, and mailings would continue to be sent to people who no longer wish to receive them. This increases the likelihood of recipients reporting your emails as spam. So, it’s best to make it easy for recipients to find your unsubscribe link. If they can’t find this unsubscribe button easily, your prospects or customers will likely report these emails as spam.


A suppression list entails more than just unsubscribes; it also contains bounced, blocked, or invalid email IDs. Repetitively mailing them may diminish your delivery rates, so spammers tend to relay the error to the ISPs, implying france phone number list that you probably don’t care or remember to maintain a live list.

So, it’s better to communicate via email only with valid email addresses that allow or want your emails.

Reported Spam
The suppression list also contains email addresses that mark your emails as spam. Sending emails to the recipients after they’ve lodged a spam complaint against your emails could cause great damage to your sender’s reputation. It indicates to ISPs (Internet Service Providers) that you are sending unsolicited emails and not listening to your audience, so your IP address or domain could get marked as spam.

Identifying Email Addresses for Suppression
Email Suppression Lists are mostly managed automatically. Email addresses that can harm your sender’s reputation are automatically blocked from receiving any future campaigns.